[Researcher]

For some reason I am finding the tiny K on the lug and a tiny V in the space forward of the lug a lot in the 150xxx and lower 160xxx range.

156491 04 red arrows to tiny K and V.jpg

156911 02 red arrows showing V and K.jpg

157318 08 red arrows to tiny V and K.jpg

158978 02 red arrows to tiny V and K.jpg

and here is one with a tiny B on the lug.

164118 01 red arrows to tiny V and B.jpg

Then back to a tiny K.

165290 01 red arrows to tiny V and K.jpg

In the upper 160xxx range we begin seeing the gauge stamped on the barrel lug.